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水泥窑共处置含Cr废物中Cr在不同温度下的形态转化

范兴广 杨玉飞 黄启飞 李忠武 于泓锦

范兴广, 杨玉飞, 黄启飞, 李忠武, 于泓锦. 水泥窑共处置含Cr废物中Cr在不同温度下的形态转化[J]. 环境科学研究, 2014, 27(3): 272-278.
引用本文: 范兴广, 杨玉飞, 黄启飞, 李忠武, 于泓锦. 水泥窑共处置含Cr废物中Cr在不同温度下的形态转化[J]. 环境科学研究, 2014, 27(3): 272-278.
FAN Xing-guang, YANG Yu-fei, HUANG Qi-fei, LI Zhong-wu, YU Hong-jin. Form Transformation of Cr during Co-Processing Waste Contained Cr in Cement Kiln at Different Temperatures[J]. Research of Environmental Sciences, 2014, 27(3): 272-278.
Citation: FAN Xing-guang, YANG Yu-fei, HUANG Qi-fei, LI Zhong-wu, YU Hong-jin. Form Transformation of Cr during Co-Processing Waste Contained Cr in Cement Kiln at Different Temperatures[J]. Research of Environmental Sciences, 2014, 27(3): 272-278.

水泥窑共处置含Cr废物中Cr在不同温度下的形态转化

基金项目: 国家自然科学基金项目(51178439)

Form Transformation of Cr during Co-Processing Waste Contained Cr in Cement Kiln at Different Temperatures

  • 摘要: 将Na2CrO4加入生料中模拟含Cr入窑物料〔掺加比例为0.048%(以w计)〕,以探索水泥窑共处置含Cr废物过程中Cr的形态转化. 将含Cr入窑物料在不同温度条件下进行煅烧,消解煅烧样品以分析Cr在不同温度下的残留率并利用XANES(X射线吸收近边结构光谱)技术分析煅烧样品中Cr的存在形态. 结果表明:对应900、1000、1100、1200、1300和1450℃煅烧条件下,熟料中Cr的残留率分别为88.2%、70.7%、73.7%、67.2%、69.5%和67.8%. 由于窑尾温度为1050~1100℃,并且Cr的残留率在1100℃较高,因此从窑尾添加含Cr废物可以减少水泥窑共处置含Cr废物过程中的Cr逸放. 在900~1450℃煅烧条件下,所有样品中的Cr主要以CrO3、Cr2O3和CaCrO4的形式存在. 1000℃煅烧温度下存在K2Cr2O7,但不存在K2CrO4;900℃和1100~1300℃煅烧温度下有K2CrO4存在,但不存在K2Cr2O7. 1100~1450℃煅烧温度下,Cr元素进入到水泥熟料的主要矿物中,并主要以CrO3和Cr2O3的形式与其他物质结合生成了较为复杂的Ca4A16O12CrO4、Ca6Al4Cr2O15等.

     

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出版历程
  • 收稿日期:  2013-07-26
  • 修回日期:  2013-10-30
  • 刊出日期:  2014-03-25

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